import java.util.Scanner;

public class Main1168 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int[] arr=new int[n];
        for (int i=0;i<n;i++){
            arr[i]=sc.nextInt();
        }
        for (int i=0;i<n-1;i++){
            for (int j=i+1;j<n;j++){
                if (arr[i]<arr[j] ){
                    int temp =arr[j];
                    arr[j]=arr[i];
                    arr[i]=arr[j];
                    arr[i]=temp;
                }
            }
        }
        double a=0;
        for (int i=1;i<n-1;i++){
            a=a+arr[i];
        }
        System.out.println(String.format("%.2f",a/(n-2)));
    }
}
